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Snare

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US8142442B2
US8142442B2 US12111870 US11187008A US8142442B2 US 8142442 B2 US8142442 B2 US 8142442B2 US 12111870 US12111870 US 12111870 US 11187008 A US11187008 A US 11187008A US 8142442 B2 US8142442 B2 US 8142442B2
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Prior art keywords
device
snare
distal
end
members
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US20080275497A1 (en )
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Olin Palmer
Christopher T. Shen
Robert LaDuca
Larry Voss
Saypin Phonthalasa
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Abbott Laboratories
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Abbott Laboratories
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • A61B17/221Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00526Methods of manufacturing
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • A61B17/221Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions
    • A61B2017/2212Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions having a closed distal end, e.g. a loop

Abstract

An intravascular snare device for use in capturing debris found in blood vessels. The snare device is fabricated from a tube and includes longitudinally and circumferentially extending members. The snare device specifically embodies structure that provides enhanced radial opening and angular resistance to collapse.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a continuation of U.S. Ser. No. 11/125,578, filed on May 10, 2005 now abandoned; which is a continuation of U.S. Ser. No. 10/457,491, filed on Jun. 9, 2003, U.S. Pat. No. 6,913,612, issued on Jul. 5, 2005; which is a divisional of U.S. Ser. No. 10/123,896, filed on Apr. 15, 2002, U.S. Pat. No. 6,592,607, issued on Jul. 15, 2003; which is a continuation of U.S. Ser. No. 09/469,431, filed on Dec. 23, 1999, U.S. Pat. No. 6,402,771, which issued on Jun. 11, 2002, the contents of which are hereby incorporated by reference.

BACKGROUND OF THE INVENTION

The present invention relates generally to intravascular snare devices and systems and more particularly, devices which can be used to capture embolic material or thrombi found in blood vessels.

The intravascular snare device and system of the present invention is particularly useful when performing balloon angioplasty, stenting procedures, laser angioplasty or atherectomy in critical vessels where the release of embolic debris into the bloodstream can occlude the flow of oxygenated blood to the brain or other vital organs, which can cause devastating consequences to the patient. The snare device is also suited for the removal of clots adhering to vessel walls. While the snare device and system of the present invention is particularly useful in the cerebral vasculature and neurovasculature, the invention can be used in conjunction with any vascular interventional procedure in which there is an embolic risk.

A variety of non-surgical interventional procedures have been developed over the years for opening stenosed or occluded blood vessels in a patient caused by the build up of plaque or other substances on the wall of the blood vessel. Such procedures usually involve the remote introduction of the interventional device into the lumen of the artery, usually through a catheter. In typical carotid PTA procedures, a guiding catheter or sheath is percutaneously introduced into the cardiovascular system of a patient through the femoral artery and advanced, for example, through the vasculature until the distal end of the guiding catheter is in the common carotid artery. A guidewire and a dilatation catheter having a balloon on the distal end are introduced through the guiding catheter with the guidewire sliding within the dilatation catheter. The guidewire is first advanced out of the guiding catheter into the patient's carotid vasculature and is directed across the arterial lesion. The dilatation catheter is subsequently advanced over the previously advanced guidewire until the dilatation balloon is properly positioned across the arterial lesion. Once in position across the lesion, the expandable balloon is inflated to a predetermined size with a radiopaque liquid at relatively high pressures to radially compress the atherosclerotic plaque of the lesion against the inside of the artery wall and thereby dilate the lumen of the artery. The balloon is then deflated to a small profile so that the dilatation catheter can be withdrawn from the patient's vasculature and the blood flow resumed through the dilated artery. As should be appreciated by those skilled in the art, while the above-described procedure is typical, it is not the only method used in angioplasty.

Another procedure is laser angioplasty which utilizes a laser to ablate the stenosis by super heating and vaporizing the deposited plaque. Atherectomy is yet another method of treating a stenosed blood vessel in which cutting blades are rotated to shave the deposited plaque from the arterial wall. A vacuum catheter is usually used to capture the shaved plaque or thrombus from the blood stream during this procedure.

In the procedures of the kind referenced above, abrupt reclosure may occur or restenosis of the artery may develop over time, which may require another angioplasty procedure, a surgical bypass operation, or some other method of repairing or strengthening the area. To reduce the likelihood of the occurrence of abrupt reclosure and to strengthen the area, a physician can implant an intravascular prosthesis for maintaining vascular patency, commonly known as a stent, inside the artery across the lesion. The stent is crimped tightly onto the balloon portion of the catheter and transported in its delivery diameter through the patient's vasculature. At the deployment site, the stent is expanded to a larger diameter, often by inflating the balloon portion of the catheter.

Prior art stents typically fall into two general categories of construction. A first type of stent is expandable upon application of a controlled force, as described above, through the inflation of the balloon portion of a dilatation catheter which, upon inflation of the balloon or other expansion means, expands the compressed stent to a larger diameter to be left in place within the artery at the target site. A second type of stent is a self-expanding stent formed from, for example, shape memory metals or super-elastic nickel-titanium (NiTi) alloys, which will automatically expand from a compressed state when the stent is advanced out of the distal end of the delivery catheter into the body lumen. Such stents manufactured from expandable heat sensitive materials allow for phase transformations of the material to occur, resulting in the expansion and contraction of the stent.

The above minimally invasive interventional procedures, when successful, avoid the necessity of major surgical operations. However, there is one common problem which can become associated with all of these types of procedures, namely, the potential release of embolic debris into the bloodstream that can occlude distal vasculature and cause significant health problems to the patient. For example, during deployment of a stent, it is possible that the metal struts of the stent can cut into the stenosis and shear off pieces of plaque which become embolic debris that can travel downstream and lodge somewhere in the patient's vascular system. Pieces of plaque material can sometimes dislodge from the stenosis during a balloon angioplasty procedure and become released into the bloodstream. Additionally, while complete vaporization of plaque is the intended goal during a laser angioplasty procedure, quite often particles are not fully vaporized and thus enter the bloodstream. Likewise, not all of the emboli created during an atherectomy procedure may be drawn into the vacuum catheter and, as a result, enter the bloodstream as well.

When any of the above-described procedures are performed in the carotid arteries, cerebral vasculature, or neurovasculature, the release of emboli into the circulatory system can be extremely dangerous and sometimes fatal to the patient. Naturally occurring debris can also be highly dangerous to a patient. That is, debris which travels through the blood vessel as a natural result of bodily functions and not as a result of an intervention procedure. Debris that is carried by the bloodstream to distal vessels of the brain can cause these cerebral vessels to occlude, resulting in a stroke, and in some cases, death. Therefore, although cerebral percutaneous transluminal angioplasty has been performed in the past, the number of procedures performed has been limited due to the justifiable fear of causing an embolic stroke should embolic debris enter the bloodstream and block vital downstream blood passages.

Medical devices have been developed to attempt to deal with the problem created when debris or fragments that naturally occur or that enter the circulatory system following vessel treatment utilizing any one of the above-identified procedures. One approach which has been attempted is the cutting of any debris into minute sizes which pose little chance of becoming occluded in major vessels within the patient's vasculature. However, it is often difficult to control the size of the fragments which are formed, and the potential risk of vessel occlusion still exists, making such a procedure in the carotid arteries a high-risk proposition.

In addition, the retrieval of fragmented clot may be incomplete, also resulting in emboli and distal occlusions, and further, access through tortuous lumens may prove difficult. Laser-based disruption devices employ the photo-acoustic effect to fragment clot. Local disruption may open up a proximal occlusion but also may cause significant distal emboli.

Other techniques which have been developed to address the problem of removing embolic debris include the use of catheters with a vacuum source which provides temporary suction to remove embolic debris from the bloodstream. However, as mentioned above, there have been complications with such systems since the vacuum catheter may not always remove all of the embolic material from the bloodstream, and a powerful suction could otherwise cause problems to the patient's vasculature. Other techniques which have had some limited success include the placement of a filter or trap downstream from the treatment site to capture embolic debris before it reaches the smaller blood vessels downstream. However, there have been problems associated with conventional filtering systems as well. In particular, certain previously developed filtering devices do not optimize the area for embolic collection. That is, conventional filtering devices may not present a collection device that spans the entity of the vessel or it may include supporting structure that itself impedes emboli collection. Certain other devices do not embody sufficient angular resistance to collapse.

Moreover, thrombectomy and foreign matter removal devices have been disclosed in the art. However, in addition suffering from the same disadvantages as certain conventional filter devices, such devices have been found to have structures which are either highly complex or lacking in sufficient or effective expansion and retraction capabilities. Disadvantages associated with the devices having highly complex structure include difficulty in manufacturability as well as use in conjunction with microcatheters. Other less complex devices can pull through clots due to in part to the lack of experience in using the same or otherwise lack an expanded profile that is adequate in capturing clots or foreign bodies.

Furthermore, in current interventional radiology practice, the need arises to remove a variety of objects from intraluminal spaces. Among these are embolic coils, guidewire tips, distal catheter segments, thrombus and other vascular emboli, few of which can be readily removed with current devices. Thrombi-embolic materials can be friable, amorphous, and/or lubricious in nature contributing to this difficulty. Most current therapies rely on grasping, fragmenting, or dissolving the blood-based obstructions. Among the grasping devices are the loop snares and the wire basket snares. These devices may have limited effectiveness, due in part to the lack of encapsulation. Objects are difficult to grasp within these devices, and friable objects, e.g. blood-based blockages, tend to fragment when grasped or pulled, introducing multiple emboli.

Lytic drugs are also used to dissolve blood-based obstructions. These typically have the disadvantages of lengthy treatment/infusion times to remove the obstruction (>3 hrs.), production of emboli, and the potential for systemic iatrogenic bleeding as a side effect of the drug usage. Also, these drugs are not typically effective in removing obstructions that are not blood-based.

What has been needed is a reliable intravascular snare device and system for use when treating blood vessels. The snare devices should be capable of capturing any naturally occurring embolic debris or that which may be released into the bloodstream during an interventional treatment, while minimizing the area occupied by structure supporting the device, and safely containing the debris until the snare device is removed from the patient's vasculature. The devices should embody an expanded profile that presents a consistent radial opening that completely occupies the vessel at the repair site as well as structure for effectively resisting collapse. Moreover, such devices should be relatively easy to deploy and remove from the patient's vasculature and also should be capable of being used in narrow and very distal vasculature such as the cerebral vasculature. The following invention addresses these needs.

SUMMARY OF THE INVENTION

Briefly and in general terms, the present invention is directed towards snares for removing undesired material or objects and restoring patency of blood vessels. The snare is a linked or monolithic framework of thin struts that is radially expansible. The snare of the present invention embodies a structure that provides a consistent radial opening as well as improved radial and angular resistance to collapse. That is, as the device is pulled such as through a vessel, the entrance thereto will not fall back or tip over. Moreover, the snare device maintains clearance in its interior space along its length allowing the material or objects to enter and be captured.

In one aspect of the invention, the snare is manufactured from a tubular element to form struts (members run both generally longitudinally and generally circumferentially) with very small widths and thicknesses and rings (circumferential members) with very small widths and thicknesses but large expansion ratios. The body of the snare device is defined by a plurality of openings bounded by generally longitudinally and generally circumferentially extending members. A proximally extending member is attached to an elongate push member and the assembly is contemplated to be used in conjunction with a generally tubular delivery catheter.

Overall, the intent of the invention is to provide a structure that has the capacity to engage and retain naturally occurring or foreign bodies while having a minimal profile that can traverse easily and repeatably through a standard microcatheter across tortuous anatomy. The device embodies superior flexibility to be deployed and retrieved consistently across difficult anatomy while being able to retain captured material. The inner diameter of the device is heat-set to a pre-determined size. It is envisioned that there be a family of devices that have varying strut lengths, thicknesses, flexibility, and diameters as deemed appropriate for the specific type of vascular or non-vascular setting for which the device is to be used.

In a presently preferred embodiment, the snare device is self-expanding and includes a midsection that forms a generally tubular profile. The proximally extending member projects from a sidewall defining the generally tubular portion to thereby provide a substantially unobstructed radial opening at the proximal end of the snare. A terminal (i.e., distal) end of the snare device can be closed so as to form a pocket for receiving emboli or thrombotic debris. In the event it is desirable to employ a snare device manufactured from a tube embodying both proximal and distal open ends, a woven basket can be attached to the distal end of the device.

The cut tube snare device can assume a number of forms. In one presently contemplated aspect, the snare device of the present invention embodies first and second end portions, a pair of longitudinally spaced rings and a midsection defined by helically extending members. In another aspect, the intravascular snare device has a midsection defined by generally parallel longitudinally extending members. In other aspects, the snare device includes a single convoluted ring or alternatively a body defined by a truncated stirrup-like structure. In yet another embodiment, the snare device has a midsection including almond-shaped apertures as viewed perpendicular to the axis of the snare.

Moreover, the present invention embodies a tip for an endovascular device including an atraumatic soft coil for preventing damage to tissue and facilitates advanceability. The tip further includes multiple layers of coiled material to enhance these objectives as well as to provide stiffness variations.

These and other objects and advantages of the invention will become apparent from the following more detailed description, when taken in conjunction with the accompanying drawings of illustrative embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view, partially in cross-section, of a vessel occluded by debris and a superior portion of a delivery catheter and intravascular snare assembly of the present invention positioned proximate the debris;

FIG. 2 is a side view, partially in cross-section, of the intravascular snare of FIG. 1 deployed within the vessel;

FIG. 3 is a plan view depicting an unrolled pattern of an intravascular snare of the present invention;

FIG. 4 is a plan view, depicting an unrolled pattern of an alternate embodiment of an intravascular snare of the present invention;

FIG. 5 is a plan view, depicting an unrolled pattern of a further alternate embodiment of an intravascular snare of the present invention;

FIG. 6 is a plan view, depicting an unrolled pattern of a fourth embodiment of an intravascular snare of the present invention;

FIG. 7 is a plan view, depicting an unrolled pattern of a fifth embodiment of an intravascular snare of the present invention;

FIG. 8 is a perspective view of the embodiment depicted in FIG. 7;

FIG. 9 is another perspective view of the embodiment depicted in FIG. 7;

FIG. 10 is an end on view from a proximal end viewpoint of the embodiment depicted in FIG. 7;

FIG. 11 is an end on view from a distal end viewpoint of the embodiment depicted in FIG. 7;

FIG. 12 is a side view, depicting an elongate member of the present invention;

FIG. 13 is a side view, partially in cross-section, depicting a plurality of coils configured about a distal end portion of the elongate members in combination with a snare device of the present invention;

FIG. 14 is a cross-sectional view, taken along lines 14-14 depicting the assembly of FIG. 13;

FIG. 15 is a side view, partially in cross-section, depicting a distal end portion of a tip of the snare device of the present invention;

FIG. 16 is a cross-sectional view, taken along lines 16-16 of FIG. 15, depicting a portion of the assembly of FIG. 13;

FIG. 17 is a cross-sectional view, taken along lines 17-17 of FIG. 15, depicting the assembly of FIG. 13;

FIG. 18 is a plan view, depicting a portion of an unrolled pattern of yet another embodiment of an intravascular snare of the present invention;

FIG. 19 is a perspective side view, depicting one step of a manufacturing process used to produce the snare device of FIG. 16;

FIG. 20 is a perspective bottom view, depicting one step of a manufacturing process used to produce the snare device of FIG. 16;

FIG. 21 is a side view, depicting an assembled snare device of FIG. 4 of the present invention including a braided structure for capturing emboli; and

FIG. 22 is a perspective view, depicting one manner of attachment of the braided structure of FIG. 21 to a loop.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring now to the drawings, and in particular FIGS. 1 and 2, there is shown the snare device of the present invention. The snare device 20 is adapted to provide more consistent and improved radial opening as well as enhanced angular resistance to collapse. Moreover, the snare device 20 of the present invention is configured to facilitate the maintenance of clearance in its interior space along its length allowing the material or objects to enter and be captured. Furthermore, since it is contemplated that the snare device 20 be manufactured from a tubular member to form elements with very small widths and thicknesses, the device is thus more easily packed to a relatively smaller diameter and inherently embodies high longitudinal flexibility.

The snare device 20 (FIG. 2) of the present invention includes a body 22 having a proximal end portion 24 and a distal end portion 26. The proximal end portion 24 is intended to be affixed to a terminal end portion of an elongate member 30 (described in more detail below). In a presently preferred embodiment, the body 22 of the snare device 20 is generally tubular with a proximally directed opening 32 and a generally closed terminal end 34 to thereby form a basket for receiving embolus, stones, thrombus and foreign bodies found in vasculature or other body cavities.

The snare device 20 for intravascular uses is contemplated to be used in conjunction with a generally tubular delivery catheter 40, such as a microcatheter. Additionally, it is contemplated that a conventional guide catheter (not shown) be used in combination with the delivery catheter 40 loaded with a snare device 20. The guide catheter is employed to provide a guide within a patient's vasculature through which the delivery catheter 40 is inserted. A proximal end of the guide includes a “Y” adapter fitted with sealing, hemostatic valves. The snare device 20 is intended to be self-expandable, however, it is possible to employ an expandable member such as a balloon catheter (not shown) to radially expand a snare device that is not self-expandable, but rather must be deformed to assume an expanded configuration.

In use, the body 22 of a snare device 20 is placed proximally in a compressed configuration coaxially within an internal bore of the generally tubular delivery catheter 20. The longitudinally extending elongate member 30 which is attached to the proximal end 24 of the body 22, is likewise coaxially received within the delivery catheter 40. Both the body 22 and elongate member 30 are slidable within the delivery catheter 40 and accordingly, the delivery catheter 40 and the snare device 20 can be displaced longitudinally with respect to each other.

A typical procedure will now be described. In order to restore patency in a vessel, the snare device/delivery catheter assembly 42 is introduced into a patient's vasculature using conventional means such as the Seldinger technique. Sometimes, a putdown is made to gain access to the patient's vasculature. Using standard endovascular techniques, the emboli in the vasculature is located. The emboli is crossed with the delivery catheter 40 and an appropriate guidewire (not shown). If the vessel is occluded, contrast is injected distal to the occlusion to map the distal vessels. The tip 26 of the delivery catheter 40 is positioned one device length or slightly more beyond the emboli. The guidewire is removed and the snare device 20 is loaded through a rear hub (not shown) of the delivery catheter 20 with the assistance of a conventional introducer sheath (not shown). The snare device 20 is advanced 30-40 cm and the introducer sheath is then removed.

Next, the snare device 20 is advanced until the tip 26 of the basket is at the distal end of the delivery catheter 40. The snare device 20 is held in place and the catheter 40 retracted to allow the device to expand. Holding the snare device 20 in place, the catheter 40 is pulled back until it is proximal to the emboli 46. The entire system is drawn back holding relative positions between the snare device 20 and the catheter 40, allowing the emboli 40 to enter the snare device 20. This step can be assisted with a “stuttering” technique where the snare device 20 is drawn out a small amount, perhaps 1-2 mm, then the elongate member 30 is advanced back perhaps 2 mm to flare the mouth of the snare device 20, assisting clot entry. Then the system is drawn out another 1 mm. This is repeated until the device 20 has traversed a distance about its own length.

If the emboli is foreign in origin, such as a coil, the basket can be moved back and forth past the coil in an iterative attempt to engage the coil in the struts of the basket. When this has occurred, the catheter 40 can be advanced and pinch the coil, locking it into one of the openings of the basket. If the emboli is not radiopaque, its position can be checked by a contrast injection. Also, the radiopaque tip 26 of snare device 20 can be observed during this process. A pulsing motion indicates restored flow.

The system 42 is then drawn back until the distal end of a proximal device marker coil (described below) is at the tip of the guide. At this point, a large syringe, perhaps 60 cc, is attached to the guide catheter at the “Y” adapter on the hub. The guide catheter is aspirated as the snare device 20 and clot 46 are drawn into the guide. Aspiration is maintained until the snare device 20 is fully into the “Y” adapter of the guide catheter, but the snare device 20 is not yet drawn through the hemostatic valve. The “Y” adapter is detached and removed with the snare device in it, allowing a moment of bleed back through the guide to flush any loose clot. Optionally, then a second “Y” arm is attached to prevent excessive bleed back. The guide is then flushed with saline and the entire procedure repeated as required to remove further emboli.

The manner in which the body portion 22 of the snare device 20 self-expands within vasculature and the resultant expansion profile provides a number of advantages. In particular, the body 22 expands to conform to the repair site 44. That is, the generally tubular profile of the body portion 22 substantially conforms to the walls defining the blood vessel 49. Alternatively, the snare device 20 can be sized such that upon full expansion it has a diameter smaller than the diameter of the vessel if desired. Moreover, the expansion of the body 22 facilitates the maintenance of clearance in its interior space along its length allowing the material or objects to enter and be captured and specifically provides a substantially unobstructed access to the proximally directed opening 32 to the body 22. Significantly, as the body 22 self-expands, members 50, 51 leading to the opening 32 to the body 22 are angled or oriented so as to be adjacent the walls defining the blood vessel 49 and are therefore substantially removed from the flow path to thereby provide an unobstructed opening 32.

In its expanded state, the snare device 20 is particularly well-suited to remove embolic or thrombotic debris 46 from the blood vessel 49. As stated, the snare device 20 can be withdrawn proximally so that the debris 46 can be captured by the body 22 of the snare device 20. Alternatively, a separate pusher mechanism (not shown) can be employed to push the debris 46 within the basket defined by the body portion 22. Once the debris has been captured, the snare device 20 and delivery catheter 40 can be removed from the patient's vasculature or the snare device 20 containing the debris 46 can first be pulled within the guide catheter (not shown) and then the assembly 42 removed from the target repair site 44. Also, just the proximal portion can be cinched down to lock the debris without being fully pulled into the delivery catheter 40.

It is to be understood, however, that thrombus or other blood-based material captured within the snare may be eliminated in a variety of ways. For example, the material may be drawn into the guide catheter with the aide of a vacuum applied to the guide catheter, and removed from the body. Also, these materials may be removed from the occluded vessel and allowed to dissolve under natural or induced lytic processes. Alternately, the blood-based material may be inserted into other vasculature more tolerant of occlusion and released.

Referring now to FIG. 3, there is shown one preferred pattern 52 of the snare device 20 of the present invention. As will be developed further below, it is contemplated that the snare pattern 52 be cut from a tubular member using a laser. As best seen in its flattened or unrolled state, the snare pattern 52 composes a body 22 including proximal and distal end portions 24, 26, a midsection 54 and an elongate member 30 extending proximally from the proximal end portion 24.

The proximal end portion 24 includes members or leashes 50 which lead to and aid in defining an opening to the body 22, when in its as cut configuration. The proximal end portion further embodies a pair of connectors 51 extending at an angle from the leashes 50 to thereby accomplish offsetting elongate member 70 from a central axis of the as cut tubular body 22 of snare device 20 as best seen in FIGS. 2 and 8. The connectors 51, in turn, converge to form a proximally directed tab 53 that is connected to the elongate member 30. The leashes 50 and connectors 51 define a centrally located, generally diamond-shaped aperture 56, having a first length, that is substantially sandwiched between two parallelogram-shaped, proximal apertures 58 having a relatively shorter second length. A proximal convoluted ring 60 defined by members 61 arranged in a generally sinusoidal pattern is located distally adjacent the proximal end portion 24. The ring 60 provides for optimal radial opening of the basket-like body 22.

The distal end portion 26 of the snare pattern 52 includes members or leashes 66 which define an open ended, distally directed triangle 68 sandwiched between a pair of two, parallelogram-shaped, distal apertures 70. A distal convoluted ring 72 defined by members 73 arranged in a generally sinusoidal pattern is located proximally adjacent the distal end portion 26. The ring 72 additionally provides for maximal radial opening of the body 27. Distally directed extensions 78 project, in a parallel fashion, from pairs of converging leashes 66.

The midsection 54 of the snare pattern 52 includes a plurality of generally parallel longitudinally extending members 84, each of which are joined at an angle and at one end, respectively, to the proximal ring 60. The other end of these members are joined at an angle to the distal ring 72.

In its as cut form, the terminal ends 80, 82 of the parallelogram-shaped, distal apertures 70 are joined together to form a substantially closed basket. This structure can be joined using soldering or by employing a coil (described hereinbelow) that is wrapped about adjacent structures to form a soft tip. Distally directed extensions 78 may be trimmed to a desired length. The longitudinally extending members 84, while maintaining a parallel relationship, each define a helical pattern to thereby form a generally tubular midsection 54. The helical configuration provides flexibility around bends as well as good foreign body containment. The members 50 form a tapered opening to the generally tubular midsection 54 with the elongate member 30 extending proximally from a sidewall defined by the midsection 54. It is contemplated that the resultant tubular structure, in an unreformed state, includes a longitudinal axis that is parallel to both the elongate member 30 and the distally directed projections 78.

In an alternative embodiment of a snare pattern 90 (FIG. 4), the proximal end and distal end portions 24, 26 also include members 50, 51, 66 which define proximal and distal parallelogram-shaped apertures 58, 70 as well as a diamond-shaped aperture 56 and an open ended triangle 68. This second snare pattern 90 also similarly includes proximal and distal rings 60, 72 as well as distally directed extensions 78, each of which are joined to one of the distal parallelogram-shaped apertures 70. Moreover, the midsection 54 of the pattern 90 includes a plurality of parallel, longitudinally extending members 84 which are joined to the structure defining the proximal and distal end portions 24, 26. This embodiment differs from the first embodiment, however, in that the longitudinally extending members are not helically configured when the pattern 90 is in its as cut form. Rather, while defining a sidewall of a generally tubular midsection 54, each of the longitudinally extending members 84 are parallel to a longitudinal axis of the resultant tubular snare device 20. Being so arranged, the midsection 54 possesses the necessary flexibility to traverse sharp bends in anatomy as well as the capability of being packed into a small profile with minimal bulk.

Further, it is to be recognized that as with the first embodiment, a substantial closed-ended basket is formed by joining via conventional means the terminal ends 78 of the snare pattern 90. Additionally, a tapered opening to a generally tubular midsection 54 is provided by the proximal end portion 24 where the elongate member 30 extends proximally from a sidewall defined by the midsection 54.

Although each of the proximal and distal rings 60, 72 are shown as embodying a four crown design, fewer or more crowns are contemplated. Moreover, there need not be a leash 50, extending from each crown. It is necessary, however, that as with the ring design depicted, the modified pattern also result in rings that provide complete open deployment consistently and reliably. To with, such rings do not fall back. That is, there is no angular deflection when the structure is pulled into a clot or foreign body.

Turning now to FIG. 5, in yet another embodiment of the snare device 20 of the present invention, a third snare pattern 100 includes a plurality of almond-shaped apertures 102 configured both circumferentially and longitudinally along the snare pattern 100. Each almond-shaped aperture includes curved members 104 shared by adjacent circumferential and longitudinal almond-shaped apertures 102.

The third snare pattern 100 additionally includes an elongate member 30 extending proximally from a pair of converging, undulating members 105 that lead to a first pair of circumferentially spaced, almond-shaped apertures 106 defined by curved members 104. Each of the first pair of circumferentially spaced, almond-shaped apertures 106 are joined and share a portion of a sidewall 104 of two of four almond-shaped apertures defining a first ring 108 of almond-shaped apertures. In a presently preferred embodiment, a series of three additional nested rings 110 of almond-shaped apertures 102, though fewer or more are contemplated, complete a midsection 54 of the third snare pattern 100. Extending from terminal ends 112 of each almond-shaped aperture 102 of the distal most ring 110, is a distally directed extension 114.

In its manufactured form, the third snare pattern 100 has a midsection 54 that defines a generally tubular shape and a closed basket is formed by joining the terminal ends 112 of the most distal ring of apertures 110. Again, the terminal ends may be joined using soldering, laser welding, adhesive, shrink wrap, or by employing a coil configured about adjacent structure.

Additionally, the resultant structure includes a tapered opening to the tubular midsection 54 where the elongate member 30 extends proximally from a sidewall defining the tubular midsection 54 and where the elongate member 30 and distally directed members 114 are each parallel to a longitudinal access of the resultant snare device 20. The distally directed members 114 can be trimmed to a desired length. An additional feature of this embodiment (and FIG. 7 described below) is that the curved transitions from tab 53 to converging, undulating members 105 enhances ease of retrieval of the device into a microcatheter.

In a fourth embodiment (FIG. 6), the snare device 20 embodies a snare pattern 120 that includes a single conventional ring 122 defined by a continuous set of interconnected members 124. The interconnected members 124 are composed of straight struts that together define a central lumen in the manufactured form. The members 124 converge at ends thereof to form four proximal and distal crowns or vertices 126, 127 on each side of the ring 122. The ring 122 serves as a central body 128 of the snare device 20.

A single member 130 extends from each of the four crowns 126, 127 of the ring in both proximal and distal directions. Proximally, the four members 130 converge into two members 132, which again converge into a single member 134. This single proximal member 134 serves as a tab for attachment to the elongated member 30.

Extending from each of the members 130 projecting from the distal crowns 127 is a single distally directed extension 136. The distally directed extensions 136 can be configured to form an atraumatic tip as described herein below.

In a fifth embodiment (FIG. 7), the snare device 20 has a pattern 140 similar to that of the fourth embodiment. In particular, this pattern also includes a convoluted ring 142 defined of a continuous set of interconnected members 144. The interconnected members 144 are composed of straight sections that together form a central lumen 146 (see FIGS. 8-11) in the manufactured form. The members converge at terminal ends thereof to form four proximal and distal crowns 147, 148 on each side of the ring 142, which serves as a central body 150 of the device 20. In this embodiment, however, alternative crowns 147, 148 at each end of the ring 142 are offset longitudinally from each other. Thus, every other interconnecting member 144 has a different length.

As with the fourth embodiment, a single member 152 extends from each of the four crowns 147, 148 in both proximal and distal directions. Further, the four members 152 connected to the proximal crowns 147 converge into two members 154, each of which again converge to form a proximal tab 156. At the distal end of the device 20, adjacent pairs of the single members 152 converge to a single extension 158. Again, the terminal ends 158 may be joined using soldering, laser welding, adhesive, shrink wrap, or by employing a coil configured about adjacent structure.

Referring now to FIG. 12, there is shown one preferred embodiment of the elongated member 30 of the present invention. The member 30 embodies a gradual or step-tapered core comprising a proximal section of 304V stainless steel and a distal section of nitinol or an equivalent material for the intended purpose. A proximal portion 160 of the member 30 has a generally constant cross-sectional profile and a first diameter 161. At a transition point 162, the member 30 begins to taper in a gradual and consistent, alternatively in a step-tapered manner, from the first diameter 161 to a second diameter 163 along a distal end portion 164.

As shown in FIGS. 13 and 14, a pair of longitudinally adjacent arranged coils 166, 168 are employed to attach a proximal tab 174 of a snare device 20 to the distal end portion 164 of the elongate member 30. The first, proximal coil 166 is contemplated to be composed of 304V stainless steel, the first coil being soldered to the elongate wire 30 near its tapered portion 170. The second coil 168 is contemplated to be comprised of about 90% platinum and 10% iridium alloy. This second coil 168, which serves as a radiopaque marker, is soldered to the elongate member 30 near a distal end portion 172 of the first coil 166. Alternatively, the second coil 168 is soldered to the first coil 166. A proximal tab 174 of the snare device 20 is contained within the second coil 168 and is soldered 176 to the elongate member 30.

Turning now to FIGS. 15-17, one presently preferred embodiment of a distal tip portion 180 of the snare device 20 of the present invention is described. The distal tip portion 180 is comprised of two partially coaxial coils 182, 184, the combination of which retains the extensions projecting from the body of the snare device 20. The combination also provides a soft atraumatic tip with variable stiffness from softest distally to stiffer proximally.

The inner coil 182 is comprised of nitinol or equivalent material, and begins at a proximal location 186 and extends to a distal location 188. The nitinol inner coil 182 provides kink resistance as well as creates a smooth stiffness transition from the tip of the basket portion of the snare device 20. The outer coil 184 is coaxially configured about a distal portion 190 of the inner coil 182 and is preferably comprised of 90% platinum and 10% iridium alloy or an equivalent combination of materials. As such, the outer coil 184 can operate as a radiopaque marker.

The distal tip portion 180 further includes a rounded terminal end 192 that provides a blunt atraumatic surface. The terminal end 192 embodies a soldered joint which acts in retaining the helical configuration of the outer coil 184.

With reference to FIGS. 18-20, a brief summary of the process used to manufacture the snare devices 20 of the present invention is provided, with a specific focus on a sixth embodiment of the present invention. As shown in FIG. 18, the sixth embodiment is relatively similar to a truncated third embodiment and defines a general stirrup-shaped pattern 220. This stirrup pattern 220 also includes a proximally directed tab 221 and a pair of diverging members 222 extending from the tab 221. Configured at each terminal end 224 of the diverging members 222 is a single almond-shaped aperture 226 defined by curved members 228. The curved members 228 further include apices 229, 230 defining outer edges of the curved member 228. Moreover, joined to a distal end 232 of each almond-shaped opening 226 is a distally directed extension 234.

It is contemplated that the snare devices 20 of the present invention be cut from a tube 235 (FIGS. 19 and 20) using conventional means such as a laser. In particular, a specific pattern is programmed into the laser device and the laser is activated to cut the desired pattern into the tubular element 235. The excess tubular components are removed, thereby leaving a manufactured structure such as the stirrup snare pattern 220 shown in FIGS. 19 and 20, corresponding to the desired pattern. In a presently preferred embodiment, a super elastic material such as nitinol is a material of choice for the snare device 20. Thereafter, post-processing such as surface treatment, burr removal and deformation of the manufactured structure is performed. Heat treating is also performed for sizing the device.

In particular, post-processing steps include taking an as-cut device and bead blast the device with aluminum oxide blasting media. The device is then inspected under a microscope for residual slag. If slag remains, the device is bead blasted again. Thereafter, the device is heat-treated in a molten salt bath without expanding. The device is subsequently heat-expanded in a molten salt bath mounted on a suitable size mandrel. After heat expansion, surface oxidation is removed in an aqua regia bath. When nitinol is the material of choice, the nitinol is etched with HF solution to desired softness or strut size. The device is then mounted on a guidewire.

In the case of the stirrup pattern 220, the post-processing may include deforming the pattern 220 and then joining together the distal end members 234 as well as adjacent apices 229, 230 for the purpose of achieving a closed basket for receiving debris found in vasculature. Being so configured, the pair of diverging members 222 define an opening to the resultant basket and the elongate member 30 extends from a sidewall defined by the pocket. Alternatively, distal end members 234 can be left apart and a basket attached to them as described below.

It is contemplated that certain circumstances may dictate other forms of a snare device 20. In particular, it is contemplated that a braided structure can be attached to a distal end portion of any of the previously described snare patterns. A braid can also be attached along the length of the body of the snare device. As shown in FIG. 21, one such braided structure 250 can be attached to, for example, a distal end portion 26, as well as the body snare pattern 90. In such a case, rather than terminating with distally directed members 78, the snare device 20 can include terminal apices 252 forming loops 254.

In one presently preferred embodiment, members 256 defining a first end 258 of the braided structure 250 can be attached to the loops 254 of the terminal apices 252 by conventional means. A second end 260 of the braided structure 250 can remain in an open configuration, or alternatively, members 256 defining the second end 260 can be joined to form a closed elongated tube.

The snare/braid assembly provides a number of advantages. In particular, such an assembly embodies additional volume for collecting debris from vasculature. Additionally, the braided structure includes sidewalls characterized by a higher density which can, in certain circumstances, be better suited for capturing relatively smaller debris found in vasculature.

Turning to FIG. 22, it is important that the leading edges 262 of the connection between the braided structure 250 and the loops 254 formed in the distal end portions of a snare pattern be as atraumatic as possible. In one presently preferred embodiment, the members 250 defining a first end 258 of the braided structure 250 are configured into a two-legged coil 263 routed such that legs 264 of the coil extend from an outer surface of the loops 254 formed in the distal end portion 26. The coil is heat-set to enhance the connection to the snare pattern. It is also contemplated that single-leg coils (not shown) could additionally be used for attachment in the event forces required to unravel the single-leg coil are greater than the force necessary to deploy and retract the braided structure 250. An atraumatic leading end, however, remains an objective, as well as space considerations (i.e., low profile for packing into microcatheter).

The snare devices of the present invention compared to prior art loop snares each provide improved radial opening since in an expanded state, the elongate member 30 is positioned substantially out of the flow path. Additionally, the device embodies improved resistance to radial loads compared to prior art loop snares. Moreover, since less deformation is required to produce a desired snare pattern, in that, angles between members are provided by laser cutting rather than from local deformations, for example, there is improved stress distribution along the snare devices of the present invention compared to prior art loop snares. Additionally, a greater reduction in radial profile can be achieved without sacrificing performance and in particular, the device can be used in conjunction with microcatheters. As such, the snare devices 20 of the present invention can be passed through narrow and tortuous vasculature. The applications of the present invention are more widespread than that of conventional snare devices because of greater retrieval characteristics while retaining the deliverability characteristics.

The above described invention is principally conceived to be operational for use in engaging for the purpose of displacing and/or removing material either foreign or native to the body, including partial or complete obstructions embolic and/or thrombotic in nature, from intraluminal or extraluminal spaces of the body including but not limited to intravascular and/or intra-arterial regions of the neurovasculature, as well as tubings, stents, or other objects that may or may not be internal to the body. The purpose of the device is to restore functionality of the luminal space or systems dependent on the particular luminal space or as a method of producing any desired effect associated with the removal or displacement of undesirable material.

The intended delivery of the disclosed invention is by means of a commercially available catheter selected to its ability to access the desired location of engagement. The invention may be optimized for specific locations or uses by means of sizing the individual elements in the design and/or the overall dimensions, as well as selection of materials, mesh configuration, number and relative geometry of component members to meet the requirements of the operational space. Optimizations may include tabs protruding from the sides of members to increase coverage of the open areas between members, offsetting vertices of joints to increase packing efficiency, or providing unconnected distal curved path. There may additionally be variations of the dimensions of length, thickness, and width of distal and proximal tabs for joining basket with delivery wire and distal tip to provide smooth stiffness transitions from tip to basket and basket to delivery wire. Such optimizations are means of adjusting operational attributes including: flexibility, applied circumferential force, engagement effectiveness, deliverability and traversal through tortuous vasculature, and volume of material to be engaged.

Alternate or additional materials for the basket portion of the device may include a thermoset, elastomer, thermoplastic constituents such as nylon, or other metal either pure or alloyed, as well as composite materials such as a combination of glass, aramid, or carbon in a binding matrix. A secondary mesh of the same or dissimilar material may be added to the basket. The wire portion of the device can alternatively be made from a single metal or combination of metals for kink resistance and high flexibility. Either or both components may be tapered to give a transition in stiffness that is appropriate for the vessel in which the invention is to be delivered. The distal tip of the device may incorporate concentric coils made of nitinol, stainless steel, or other metal or plastic to provide a soft flexible atraumatic end.

An alternate method of manufacture of the basket portion of the device may be etching, or metal or polymer injection molding. Furthermore, the device may employ any combination of coatings, agents, or features including those of that result from material addition or subtraction to create grooves, bumps, three dimensional patterns, and textures on inner and/or outer surfaces or any combination thereof to promote desired properties such as adherence of materials to be engaged, radiopacity, and low friction between the device and the vessel wall or microcatheter lumen.

In summary, the invention is deliverable to remote regions of the neurovasculature by gaining access through the use of a guidewire and microcatheter in the vasculature and subsequent deployment of the invention through the lumen of the microcatheter. In a vessel in which flow is impeded or obstructed by material and/or objects including those formed by the body such as blood clot, the device is deployed by withdrawing the microcatheter relative to the wire. Engagement occurs as the system composed of the invention and microcatheter is pulled into the material. After the material has been engaged, removal of the material is accomplished by withdrawing the system into a guide catheter lumen through which the microcatheter is passed with or without simultaneously pulling fluid through the guide lumen.

Thus, it will be apparent from the foregoing that, while particular forms of the invention have been illustrated and described, various modifications can be made without the parting from the spirit and scope of the invention. Accordingly, it is not intended that the invention be limited, except as by the appended claims.

Claims (16)

1. A snare device for use in vasculature, comprising:
an elongate member having a first end and a second end;
a distal tip portion located on the second end of the elongate member, the distal tip portion including a first coil and a second coil, the second coil being disposed adjacent to the first coil, the first and second coils being made from different materials; and
a body configured to engage or capture material found in the vasculature, the body including a proximally extending tab which is attached to the distal tip portion of the elongate member, wherein at least a portion of the second coil is disposed over at least a portion of the proximally extending tab.
2. The device of claim 1, wherein the distal tip portion includes a blunt terminal end formed from a solder joint.
3. The device of claim 1, wherein the first coil is made from nitinol.
4. The device of claim 3, wherein the second coil is made from an alloy made from about 90% platinum and about 10% iridium.
5. The device of claim 1, wherein the distal tip portion includes a weld which connects the proximally extending tab to the distal end of the elongate member.
6. The device of claim 1, further including a weld connecting the first coil to the distal end of the elongate member.
7. The device of claim 6, further including a weld connecting the first coil to the second coil.
8. The device of claim 1, further including a weld connecting the second coil to the distal end of the elongate member.
9. The device of claim 1, further includes a weld which connects the proximally extending tab to the distal end of the elongate member.
10. The device of claim 1, wherein the body includes a distal end having a distal tip made from an inner coil and an outer coil attached thereto, the outer coil being coaxially disposed about at least a portion of the inner coil.
11. The device of claim 10, wherein the inner coil is made from nitinol.
12. The device of claim 11, wherein the outer coil is made from an alloy made from about 90% platinum and about 10% iridium.
13. The device of claim 10, wherein at least a portion of the body extends distally from the distal end of the elongate member.
14. The device of claim 1, wherein the first coil is made from stainless steel.
15. The device of claim 14, wherein the second coil is made from an alloy made from about 90% platinum and about 10% iridium.
16. The device of claim 1, wherein at least a portion of the body extends distally from the distal end of the elongate member.
US12111870 1999-12-23 2008-04-29 Snare Active 2022-09-20 US8142442B2 (en)

Priority Applications (5)

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US09469431 US6402771B1 (en) 1999-12-23 1999-12-23 Snare
US10123896 US6592607B1 (en) 1999-12-23 2002-04-15 Snare
US10457491 US6913612B2 (en) 1999-12-23 2003-06-09 Snare
US11125578 US20050222607A1 (en) 1999-12-23 2005-05-10 Snare
US12111870 US8142442B2 (en) 1999-12-23 2008-04-29 Snare

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US12111870 US8142442B2 (en) 1999-12-23 2008-04-29 Snare
US13410903 US9113936B2 (en) 1999-12-23 2012-03-02 Snare

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US11125578 Continuation US20050222607A1 (en) 1999-12-23 2005-05-10 Snare

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US13410903 Continuation US9113936B2 (en) 1999-12-23 2012-03-02 Snare

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US20080275497A1 true US20080275497A1 (en) 2008-11-06
US8142442B2 true US8142442B2 (en) 2012-03-27

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US09469431 Active US6402771B1 (en) 1999-12-23 1999-12-23 Snare
US09801256 Active 2020-12-31 US6641590B1 (en) 1999-12-23 2001-03-06 Snare
US10123896 Active US6592607B1 (en) 1999-12-23 2002-04-15 Snare
US10457491 Active 2020-07-23 US6913612B2 (en) 1999-12-23 2003-06-09 Snare
US11125578 Abandoned US20050222607A1 (en) 1999-12-23 2005-05-10 Snare
US12111870 Active 2022-09-20 US8142442B2 (en) 1999-12-23 2008-04-29 Snare

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US09469431 Active US6402771B1 (en) 1999-12-23 1999-12-23 Snare
US09801256 Active 2020-12-31 US6641590B1 (en) 1999-12-23 2001-03-06 Snare
US10123896 Active US6592607B1 (en) 1999-12-23 2002-04-15 Snare
US10457491 Active 2020-07-23 US6913612B2 (en) 1999-12-23 2003-06-09 Snare
US11125578 Abandoned US20050222607A1 (en) 1999-12-23 2005-05-10 Snare

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